I have a TCI planetary that was a 1.89 helical cut gearset. It's an aftermarket housing with bolt in pins, the heavy duty type. It chipped a tooth off one of the gears and made a bunch of loud noises...lol. It was not happy. Question for some trans builders...Can I take that housing and order a set of 1.80 straight cut gears, new sun gear, ring gear and a shim and needle bearing kit and use the housing over? It had some gall marks on the outside of the housing where the pieces were forced though, no damage to any of the machined faces or critical areas that I can see.